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Home >> Chrysler >> 2005 >> 300 Base >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0330 To P0481 >> Diagnosis And Testing >> P0420-Catalyst 1/1 Efficiency >> Possible Causes

Possible Causes

Possible Causes 
EXHAUST LEAK
ENGINE MECHANICAL CONDITION
AGING O2 SENSOR
CATALYTIC CONVERTER

Always perform  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  before proceeding. 

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